62001).pdf 3 / 8 67% 2(a) An alloy wire with 4.0 mm diameter has resistance of 50 at a temperature of 20. Determine: 0 t

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62001 Pdf 3 8 67 2 A An Alloy Wire With 4 0 Mm Diameter Has Resistance Of 50 At A Temperature Of 20 Determine 0 T 1 (62.55 KiB) Viewed 23 times

62001).pdf 3 / 8 67% 2(a) An alloy wire with 4.0 mm diameter has resistance of 50 at a temperature of 20. Determine: 0 the length of the alloy wire, given that the resistivity of the alloy material is 3.14 x 10 m; (2 marks) (ii) the wire resistance at 40°C if the temperature coefficient of the alloy material at 20°C is 0.07 "C! (2 marks) (1 mark) (b) A production machine operates for 8 hours per day. The machine with power rating of 1200W worked for 25 days in last month and the supply voltage to the machine is 250V. If the electricity charge is HKSI 25 per kWh, please response to the following questions: (i) Determine the supply current for the production machine, and () Calculate the electricity bill for last month (11) As the industrial plant operations are costly especially for the electricity use proposed 4 methods that help reducing the energy cost for typical plants in Hong Kong environment (e) For the circuit shown in Figure 2e), determine: (2 marks) (8 marks) (1) the total resistance, R. marks) (ii) the supply current, I (2 marks) (b) the branch current. Isund (marks) (iv) the potential difference Vacross the resistor 2 marks) ly RS W 20062 40V RI HOS R WW R 55002 R R w 45002 1602 ER May 20 PARA